The invention discloses a courts household change relationship identification system and method based on power line broadband carrier communication. The courts household change relationship identification system comprises a marketing system, a metering automation system, a concentrator, a power line broadband carrier concentrator module, a power line broadband carrier electricity meter module, anelectricity meter, a courts household change relationship identification module and a courts household change relationship identification platform, for completely the entire process works of file establishment, file issuance, file identification and maintenance and file update of a courts household change relationship, and except power line carrier communication signals, other noise and effects are not imported. The identified household change relationship is written back into the marketing system, the marketing system pushes the updated household change file information to the metering automation system, the metering automation system issues correct electricity meter file information to the concentrator of the corresponding courts, the operation of technicians are not needed, the closed-loop management of the household change relationship is achieved, the automation is achieved in the entire process, and the working efficiency of power consumption collection and management of an electric power system is improved.